MEXICO CITY — Mexico said Friday that it seized 229 metric tons of precursor chemicals used to make methamphetamine, the third such huge seizure this month at the Pacific port of Lazaro Cardenas, all of which were bound for a port in Guatemala.

The seizure brings to more than 534 tons the amount of meth chemicals detected at the Mexican port in less than a month.

Authorities announced on Dec. 19 that they had found almost 100 metric tons of methylamine at Lazaro Cardenas, and earlier said that 205 tons of the chemical had been found there over several days in early December.

Experts familiar with meth production call it a huge amount of raw material, noting that under some production methods, precursor chemicals can yield about half their weight in uncut meth.

The Attorney General’s Office said the most recent seizure was found in 1,600 drums, and had been shipped from Shanghai. The Associated Press

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